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A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
No Way Back Home Mathematics 100
Beatboxer Symmetric Ciphers 150
MDFlag Hash Functions 125
TLS Handshake Crypto on the Web 15
Saying Hello Crypto on the Web 20
Weekly Top Users
#1 4yn 5400
#2 remy_o 4875
#3 Glacier 2140
#4 Devrar 2130
#5 kusano 1560
Recent Solves
Vectors m0h1th
Beatboxer Daytime
Legendre Symbol tsof
Real Curve Crypto Kuruwa
Keyed Permutations cs71107
Recent Solutions
No Way Back Home FedericoUT 0
MDFlag willwam845 3
Real Curve Crypto remy_o 0
Lo-Hi Card Game ConnorM 0
ECB CBC WTF C3real 0

Level Up

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